22 · Diagnostics

Air bag failure warning light on

Make: Fiat
Model: Grande Punto Factory Service Manual
Year: 2005–2012
Section: Instrument panel › Air bag failure warning light on

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Fault diagnosisAir bag failure warning light on

AIR BAG FAILURE WARNING LIGHT ON

The brake fluid warning light remains on with the handbrake released.

The (negative) brake fluid level signal is sent by the sensor to the Body Computer Node which makes it available via the B-CAN to the Instrument Panel Node.

The Instrument Panel Node lights up the dedicated warning light and displays the insufficient brake fluid level message; if the warning light is faulty, the appropriate message is displayed.

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Results of the tests
	Connect an EXAMINER and check the following on CAN NETWORK INFORMATION: - no control unit inactive; - no faulty control units; - no control units with faulty CAN	Move on to Step 1	1. Fault on CAN network 2. Communication impossible with the Body Computer	1. Continue following the instructions for the diagnostic equipment 2. Move on to Step 2
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Keeping the Examiner connected, check the plausibility of the brake fluid level parameter at the Body Computer Node	Move on to Step 4	1. The parameter is not plausible 2. Impossible to connect to the Body Computer control unit.	1. Replace body computer Op. 5505A32 BODY COMPUTER - R.R 2. Move on to Step 2
2	ELECTRICAL POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check the electricity supply to the Body Computer Node is correct	Move on to Step 3	Fault in positive electrical supply and/or earth	Replace defective component (in the case of a fuse, find out what caused it to blow).
3	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Use an Examiner to check the possibility of connection to the Body Computer Node	Move on to Step 4	Impossible to connect to the Body Computer control unit	Replace Body Computer Op. 5505A32 BODY COMPUTER - R.R
4	BRAKE FLUID LEVEL CHECK	All OK	Problems encountered	Operation
	Check that the brake fluid level is not low	Move on to Step 8	Insufficient brake fluid level	Move on to Step 5
5	BRAKE FLUID LEVEL TOP UP	All OK	Problems encountered	Operation
	Top up the brake fluid level and check that the warning light goes out	End of diagnosis	The warning light does not go out	Move on to Step 6
6	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Keeping the diagnostic equipment connected, check that there are no CAN faults at the BRAKE NODE	Move on to Step 7	Fault on C-CAN network	Move on to Step 12
7	ELECTRICAL SYSTEM CHECK	All OK	Problems encountered	Operation
	Disconnect the connector from the oil level sensor and check that it is working properly See Test 3330AA INSUFFICIENT BRAKE FLUID LEVEL SENSOR CHECK	Move on to Step 8	Brake fluid level sensor defective	Replace the sensor Op. 3330C44 BRAKE FLUID MINIMUM W/L SWITCH - R + R
8	ELECTRICAL SYSTEM CHECK	All OK	Problems encountered	Operation
	Check the continuity of the cable from the connector to the Body Computer see wiring diagram See E4010 INSTRUMENT PANEL	Move on to Step 9	Lead broken	Restore the correct connection
9	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner and check that plausibility of the handbrake applied parameter at the Body Computer Node	Move on to Step 10	The parameter is not plausible	Proceed as instructed See table K072 HANDBRAKE APPLIED WARNING LIGHT
10	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Keep the Examiner connected and check the operation of the brake fluid level warning light in active diagnosis at the Instrument Panel Node	Move on to Step 11	The warning light does not flash	Replace instrument panel Op. 5560B10 CONTROL PANEL - R+R
11	ELECTRICAL POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check the electricity supply to the Instrument Panel Node is correct.	Move on to Step 12	Fault in positive electrical supply and/or earth	Replace defective component (in the case of a fuse, find out what caused it to blow).
12	CHECK ELECTRICAL CONNECTIONS	All OK	Problems encountered	Operation
	Check the wiring between the Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connected.	Move on to Step 13	Electrical connections not operational	Renew the damaged electrical connections
13	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Keeping the Examiner connected, check the plausibility of the brake fluid level parameter at the Body Computer Node	End of diagnosis	The parameter is not plausible	Replace the Body Computer

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Parts & tools for this job For 2005 Fiat Grande Punto

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